Determination of lead and tin in bronze materials in oil bearings by selective dissolution separation-inductively coupled plasma atomic emission spectrometry
The bronze oil bearing is the combination of two materials,i.e.,carbon steel and bronze.For the determination of lead and tin in bronze materials,the selective dissolution separation method was used.The immersion solution was prepared by dissolving 80 mL of hydrogen peroxide,75 g of ammonium per-sulfate,60 g of ammonium citrate,2 g of hexamethylenetetramine and 40 g of ammonium chloride in water followed by dilution to 1 L.The bronze sample was digested using the immersion solution prepared.The bronze material was completely released from the carbon steel back in the immersion solution at pH 8-9 and(35±2)℃ by ultrasonic.The excessive chemicals were removed by boiling.Then aqua regia was added to dissolve the insoluble matters in the immersion solution until the solution was clear.The influence of ma-trix effect was eliminated by matrix matching method.The contents of lead and tin were determined by in-ductively coupled plasma atomic emission spectrometry(ICP-AES).The method for the determination of lead and tin in bronze materials in oil bearings by ICP-AES after selective dissolution separation was estab-lished.The concentration of lead(5.0-50.0 mg/L)and tin(1.0-20.0 mg/L)showed good linear relation-ship with the corresponding emission intensity,and the linear correlation coefficients were higher than 0.999.The limits of detection for lead and tin were 0.5 mg/L and 0.1 mg/L,respectively.The contents of lead and tin in three oil bearing samples were determined according to the experimental method,and the relative standard deviations(RSD,n=5)of determination results were within 2％.The spiked recoveries were between 99.0％and 101.4％.The experimental method was compared with the national standard method GB/T 5121,and the found results were consistent.
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